Put a little original neosporin on his hurt area. I would keep him in a ten gallon tank on paper towel substrate with a clean water bowl for one week. Change the papertowels every day, along with the water in the water bowl. His wounds, if they are just on the surface, should seal off in a week or so. Then if you'd like, set him free. Put new neosporin on each day. Be sure it is only the ORIGINAL, because the ones with pain reliever will kill him.

Of you can't care for him for a week, put the neosporin on in a slightly thicker layer and put him back outside.

Good luck! Nice of you to save him .

Kristen is right, he definitely can't live with your tree frogs.